Sofa



FIG. 1 is a front and side elevational view of a sofa showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is an elevational view thereof taken from the right side of FIG. 2;

FIG. 4 is an elevational view thereof taken from the left side of FIG. 2;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a top plan view thereof. 

The ornamental design for a sofa, as shown and described. 